EMPLOYEE BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2014	Jul. 31, 2014	Jun. 30, 2014	Sep. 30, 2014 Pension Benefits	Sep. 30, 2013 Pension Benefits	Sep. 30, 2014 Pension Benefits	Sep. 30, 2013 Pension Benefits	Sep. 30, 2014 Other Postretirement Benefits	Sep. 30, 2013 Other Postretirement Benefits	Sep. 30, 2014 Other Postretirement Benefits	Sep. 30, 2013 Other Postretirement Benefits
Components of net periodic benefit cost (including amounts capitalized to the balance sheets)
Service cost				$ 6.2	$ 7.5	$ 18.7	$ 22.6	$ 5.2	$ 6.3	$ 15.9	$ 18.7
Interest cost				19.0	17.8	58.0	53.4	5.7	6.2	18.0	18.6
Expected return on plan assets				(28.0)	(26.4)	(85.4)	(79.1)	(8.3)	(7.7)	(25.0)	(23.0)
Loss on plan settlement				0	0	0.9	0	0	0	0	0
Amortization of prior service cost (credit)				0.1	1.0	0.4	3.0	(2.7)	(0.7)	(6.8)	(1.9)
Amortization of net actuarial losses				8.3	14.2	25.3	42.5	0.9	2.1	2.4	6.3
Net periodic benefit cost				5.6	14.1	17.9	42.4	0.8	6.2	4.5	18.7
Pension and other postretirement net assets transferred in the sale	26
Pension and other postretirement assets transferred in the sale	150
Pension and other postretirement obligations transferred in the sale	124
Contributions to the plans						95.2				0.2
Expected contributions to the plans during the remainder of fiscal year						5.0				10.6
Expected contributions to the plans during the remainder of the fiscal year from the Rabbi trust						2.0
Rabbi trust funding related to potential change in control		$ 64.8	$ 65.0